<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title>递减五</title>
	</head>
	<body>
		<script>
			var i = 100;
			while(i!=0){
				alert(i);
				i=i-5;
			}
			
		</script>
	</body>
</html>
